I defer to other who know more about how this *really* works, but the notes I took said this: in some PRI subtests, you get bonus points for speed. If PSI is slow, you shouldn't be able to do block design well. If PRI is high and PSI low, you need to worry about why the kid couldn't do the tasks on the PSI because the kid was fast in some things and it wasn't just about speed. He said good PRI scores rule out real speed issues and visual deficits.

But really . . . . . I'm in over my head and don't know anymore than that. confused